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September 8, 2026

Senior Back-end Developer - Kotlin

Senior • Remote

110 - 130 PLN/yr

Warsaw, Poland

We are looking for a Senior Back-end Developer with strong experience in Kotlin and Java-based backend development, working with modern reactive technologies.

Requirements

  • Minimum 6 years of professional experience in backend software development
  • Strong hands-on experience with Kotlin, Java 17+, Vert.x, Spring Boot / Spring WebFlux, and Hibernate
  • Solid understanding of backend application development and modern software engineering practices
  • Experience developing and maintaining scalable backend services
  • Good understanding of reactive programming and non-blocking application development
  • Ability to troubleshoot and resolve complex technical issues
  • Ability to work independently and contribute effectively within a development team
  • Good communication and collaboration skills

Nice to have

  • Experience with microservices architecture
  • Experience working with REST APIs
  • Experience with cloud-based environments
  • Knowledge of CI/CD and Agile development practices

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